Chalk-trough for blackboards.



e. s. KNAPP. CHALK THOUGH FOR BLAC'KBOARDS.

- Patented Sept. 24, 1918.

ado/p6 J pnrrnn s reams Paren s ensues.

GEORGE S. KNAPP, OF LA GRANGE, ILLINOIS, ASSIGNOR TO KNAPP BROTHERSMANU- FACTURING COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OFILLINOIS.

To all whom it may concern Be it known that I, GEORGE S. KNAPP, acitizen of the UnitedStates, residing at La Grange, in the county ofCook and State of Illinois,'have invented certain new and usefulImprovements in Chalk-Troughs for Blackboards, of which the followingisa specification.

This invention relates to improvements in chalk troughs, particularlyfor use in connection with blackboards and the like, and the object ofthe invention is to provide a simply constructed and readily installeddevice of this character and one which is neat and attractive inappearance, sanitary in construction and having a removable false bottomin the trough for normally holding the crayon and erasers and to receivethe crayon and other dust and which false bottom may be readily removedfor cleaning and other purposes.

Other objects of this invention include improvements in details ofconstruction and arrangement whereby a very simple and attractiveconstruction of this type is provided.

To the accomplishment of the foregoing and such other objects as mayhereinafter appear my invention consists in the construction,combination and arrangement of parts hereinafter described and thensought to be defined in the appended claims, reference being had to theaccompanying drawings forming a part hereof and which shows, merely forthe purpose of illustrative disclosure, a preferred embodiment of myinvention, it being expressly understood however that various changesmay be made in practice within the scope of the claims withoutdigressing from my inventive idea.

In the drawings,

Figure 1 represents a perspective view of a device constructed accordingto my invention installed in position for use.

Fig. 2 is a vertical transverse cross section through the same takensubstantially on line 22 of Fig. 3.

Fig. 3 is a top plan view of one end of the same, part of the falsebottom being removed to show details of construction.

Referring now to the drawings, the numeral l designates the blackboardor other surface to which the device is adapted to be attached. Thedevice itself comprises the body part 2, which is preferably formed ofCHALK-TROUGH FOB BLACKBOARDS.

Specification of Letters Patent. Patented Sept. 24, 191 8. Applicationfiled July 20, 1918. Serial No. 245,820.

an elongated integral piece of sheet metal bent or shaped to provide atrough part which includes an outwardly curved or convex rear wall 3, afiat bottom part 4, an out wardly inclined front wall 5, bent over, asat 6, and then downwardly, as at 7 to form the outer front wall havingthe downwardly -inclined portion 8 terminating in thesubstantiallystraight edge part 9, the parts 8 and 9 forming a supportfor the trough provided by the parts 3, 4 and 5, and the edge bearingagainst the wall or surface, as indicated. V

The ends of this elongated member 2 are closed by the end pieces 10which are shaped, as shown, and are formed with the flange 11corresponding substantially in shape to the cross section of the member2, the ends of which rest against the said flange, as clearly shown inFig. 2. Each member 10 is also provided with the projection 12 toreceive the securing means 13 by which the member 2 is connectedthereto.

Removably mounted in the trough provided in the top part of member 2 isthe false bottom member 14, which is crimped, as shown, to provide aplurality of corrugations or ridge 15 and having its edges restingagainst the front and rear parts 3 and 5 of the member 2, as shown. Thismember 14 is frictionally held in position and is readily removabletherefrom for cleaning and other purposes and when in trough part and abracing part therefor,

and a false bottom member transversely crimped to provide a plurality oflongitudinally extending ribs and alternate depres sions removablymounted in said trough art.

p 2. A chalk trough of the character described including an elongatedbody member formed of sheet metal to provide a trough part and-a bracingpart therefor,

and a false bottom member rcmovably mounted in said trough part, said.false bot tom member being crimped to provide a plurality ofcorrugations.

3. A chalk trough of the character described including in combination anelongated body member formed of an integral piece of sheet metal andshaped to provide a trough part having a convexed rear Wall and anoutwardly inclined front wall and also having a brace part extending"thereunder to a point in the same vertical plane with the rear wall ofthe trough part end members for said body member, each having a flangeshaped to correspond to the cross sectional shape of the body member toreceive the end edges thereof, and a removable false bottom positionedin said trough part.

4:. A chalk trough of the character demembers for said body member, eachhaving a flange shaped to correspond to the cross sectional shape of thebody member to receive the end edges thereof, and a removable falsebottom positioned in said trough part said removable false bottom beingcrimped to provide a plurality of corrugations.

In testimony whereof I hereunto subscribe my name. 1

GEORGE S. KNAPP.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Iatents, Washington, D. C."

